CTBT : France hosts an advanced infrasound training [fr]

The CEA/DAM/DASE facility in Bruyères-le-Châtel has welcomed, from 14 till 18 October, around 10 CTBTO and States Signatories experts during a training workshop dedicated to advanced training on infrasound data analysis.

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Hosting in Bruyères-le-Châtel (CEA/DAM) of a capacity building worskhop on the infrasound technique

From 14 till 18 October, France hosted in the CEA/DAM building a dedicated capacity building workshop on “advanced infrasound data analysis”. This workshop was the very first of a kind for advanced experts organized by the Provisional technical Secretariat (PTS) of the Comprehensive Nuclear Test ban treaty Organization (CTBTO). It was the last step of a training cycle offered to experts coming from National Data Centers (NDC).

Six experts coming from CTBTO NDCs participated to the workshop, originating from Austria, Congo, Costa Rica, Indonesia, Portugal and Rumania, along with two experts from the PTS. The capacity building was delivered by French experts of the environmental assessment and monitoring Department (Département analyse, surveillance, environnement, DASE) that underlined the use of specific tools developed by the CEA/DAM/DASE for the “NDC-in a box” software (Dase Tool Kit DTK-GPMCC et DTK-DIVA).

The "NDC-in-a-box" software is aimed at making all national data centres able to analyse in full autonomy and independance, the data collected by the stations of the international monitoring system (IMS). During the session, participants were introduced to all functionalities, configurations, automatic and manual data processing, data quality management, weather information, etc.
As an introduction, some theory was introduced on infrasound measurements (detection, filter, atmospheric structure, etc.)

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Contributions have been about theory but als with several concrete applications which dealt with several examples : series of explosions, meteorites, volcano, sea tides, seismo-acoustic coupling... the training goal was really to understand what is detect by an IMS infrasound station and to be able to analyse the data in term of source effect, propagation and noise.
Participants also visited the ADBF station located in the vicinity of the training facility.

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A lookback on the infrasound technique

Among the four technologies developed for the international monitoring system, the infrasound technique is the one with the most recent developments and for which France committed itself from the very beginning into research and design of detectors able to answer the requirements defined in the Treaty. The latest generation of detectors has been designed by the CEA/DAM and is now built by the SEISMOWAVE Company, located in Britany.

Infrasound monitoring
Why?
To monitor the Earth mainly for atmospheric nuclear explosions.

Localisation
At 60 IMS stations in 35 countries around the world.

How?
Infrasonic sensors measure micropressure changes in the atmosphere which are generated by the propagation of infrasonic waves. These very low frequency waves can also be created by atmospheric nuclear explosions.

When?
Infrasound stations relay data continuously 24 hours a day and seven days a week in real time to the International Data Centre (IDC) in Vienna. Once received, data are analyzed and data products are transmitted via satellite to the CTBTO Member States.

More information

Dernière modification : 21/11/2019

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